Worksheet 380 · Skill 3

Dead reckoning

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1. At 1000 you fix your position 263°T, 3.6 nm from Tern Island tower. You steer 036°T at 7.6 kn until 1015, then 261°T at 6.6 kn until 1100.

   Give the 1100 DR position as the true bearing FROM Westfield church spire to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Westfield church spire: ________ °T   Distance: ________ nm  

2. At 1515 you fix your position 203°T, 2.6 nm from Tern Island tower. You steer 083°T at 4.2 kn until 1545, then 181°T at 8.4 kn until 1600.

   Give the 1600 DR position as the true bearing FROM Gannet Rock daybeacon to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Gannet Rock daybeacon: ________ °T   Distance: ________ nm  

3. At 1200 you fix your position 275°T, 1.9 nm from Tern Island tower. You steer 245°T at 5.4 kn until 1230, then 294°T at 8.1 kn until 1255.

   Give the 1255 DR position as the true bearing FROM Westfield church spire to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Westfield church spire: ________ °T   Distance: ________ nm  

4. At 1555 you fix your position 348°T, 2.7 nm from Mill stack. You steer 069°T at 4.0 kn until 1615, then 331°T at 5.9 kn until 1630.

   Give the 1630 DR position as the true bearing FROM Tern Island tower to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Tern Island tower: ________ °T   Distance: ________ nm  

5. At 1030 you fix your position 025°T, 3.3 nm from Westfield church spire. You steer 134°T at 9.7 kn until 1045, then 301°T at 7.3 kn until 1055.

   Give the 1055 DR position as the true bearing FROM Westfield church spire to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Westfield church spire: ________ °T   Distance: ________ nm  

6. At 0835 you fix your position 060°T, 3.5 nm from Heron Point Light. You steer 017°T at 8.3 kn until 0910, then 135°T at 7.0 kn until 0920.

   Give the 0920 DR position as the true bearing FROM Tern Island tower to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Tern Island tower: ________ °T   Distance: ________ nm  

7. At 1435 you fix your position 064°T, 1.3 nm from Gannet Rock daybeacon. You steer 029°T at 5.4 kn until 1500, then 153°T at 8.3 kn until 1510.

   Give the 1510 DR position as the true bearing FROM Gannet Rock daybeacon to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Gannet Rock daybeacon: ________ °T   Distance: ________ nm  

8. At 1440 you fix your position 250°T, 2.7 nm from Tern Island tower. You steer 279°T at 10.0 kn until 1505, then 149°T at 4.2 kn until 1530.

   Give the 1530 DR position as the true bearing FROM Westfield church spire to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Westfield church spire: ________ °T   Distance: ________ nm